Trimming mechanism for sewing-machines.



' A. GRIEB.

TRIMMING MECHANISM FOR SEWING MACHINES.

APPLIOATIOF FILED APR. 25. 1908.

Patented Aug. 31, 1909.

3 SHEETB-SHEET 1.

WITNESSES.-

IA'V NTOR.

4 ATTORZVE) A. GRIEB. TBIMMING MBcHAmsM FOB snwme monmns.

APPLICATION FILED APR. 26, 190B.

Patented Aug. 31, 1909.

IXVENTOR.

A TTORXE Y.

A. GBIEB. TBIHMING MECHANISM FOB SEWING MAOHINES;

APPLICATION EILED APR. 25. 1908. V V 4 933,033. Patented Aug. 31. 1909.

1% 3 SHEETS-SHEET 3.

j 1 o 10093 S l 3 10+ wi I05 L 10 l WITNESSES: m VENTOR- ATTORNEY.

the needle-actuating rock-lever.

UNITED STATES PATENT OFFICE.

ALIBED am, or nmzuin'rn, nw Instr, arena: To an]: amen. lmncmmo COMPANY,A conrona'rrbu or m..rml:r.

TRImNG MEGEAKIBM FOB SEWING-MACHINES.

Specification of Letters Patent.

Patented Aug. 31, 1909.

Original application filed April 18, 1907, Serial No. 868,085. Dividedand this application filed April 25, 1908.

Serial No. 420,165.

This application is a division of my application Serial No. 368,035,filedv April 13, f

lSlOT.

The present invention relates to an improvement 1n trimming mechanism,and particularly mechanlsm of this character designed especially foroperation in conjunction with overseaming stitch-forming mechanism.

The invention has for its primary object to provide simple and effectivecarriers for the coijperatin cuttin implements and means for readilyadjusting them for determining the cutting line.

It has for its further object the provision of a suitable shield actingin conjunction with the trimming members for deflecting the cuttingsfrom the trimming point, and a cord-guide following the lateraladjustments of the trimming members and said shield and adapted to lay acord along the cut edge of the material to be embraced by the overseam.

The invention consists in the several constructivc features herein shownand described and pointed out in the appended claims.

In the accompanying drawings, Figure 1 is a front side elevation of anoverseaming and trimming machine embodying the pres ent improvements,with the balance Wheel and the greater portion of the work-plate omittedand a part of the casing broken away to expose the operative partsbehind the same. Fig. 2 is a plan of the machine with the greaterportion of the work-plate omitted to expose the mechanism beneath thesame. Fig. 3 is a sectional end elevation of the machine taken in avertical plane passing through the axis of oscillation of Flg. 4 is aperspective view representing the coiiperatmg trimming members withthelrcarriers and adjacent parts. Fig. 5 is an enlarged sectional elevationof a portion of the v1- brating trimmer lever with the upperknifecarrier and knife secured therein. Fig. (5 is a perspective View ofthe upper knifecarrymg block, and Fig. 7 a similar view upon a lar erscale of the gib to which the upper kni e-blade is fitted. Fig. 8 is adetached view. partly in section. of the lower knife clamping member.Fig. 9 is a perspective View of the trimmings deflecting shield with itscarrying bar and connected parts. Fig. 10 a front end View of the same,and Fig. 11 is a perspective view representingthe inner side of the cordguiding member.

The machine is constructed with the base 1 having journaled in suitablestandards the longitudinally extending main-shaft 2 shown supported atits rearward end by a bushing 3 and provided adjacent thereto with aneedle actuating ball-crank 4. The

top of the base 1 is provided with a seat to which is fitted and securedby means of screws 5 the foot 6 of the bracket-arm 7 provided withlateral bearing bosses 8 and with a head 9 in which is fitted thereciprocating needle-bar 10 carrying the eyepointed needle 11. Theneedle-bar has fixed thereon the collar 19. having a. lateral lugconnected by means of the link 13 with the forward end of the rock-lever14 mounted upon the fulcrum-pin 15 journaled in the bearing bosses 8 andhavinga rearwardly extending crank-arm 16. The crank-arm 16 carries aball 17 embraced by a strap 18 at the upper end of the pitman 19 havingat its lower end a strap 20 embracing the ballcrank 4 upon themain-shaft.

As herein represented, the machine is provided with a primarytluezul-carrriug loopi-r 21 and a secondary tlireml-carrying loopin- 22;The primary thread-carrying looper is mounted upon a carrier 23 fulrnnwd upon the machine frame at 24, and the secondary looper is mountedupon {5 carrier '35 fulcrumed upon the machine frame at 1" and providedwith :1 crank arm luiviu; a ball 27 embraced by a strap at one end of apuman 28 whose other end carries a strap emhnu-iug a crank member :29upon the maiwshaft. The secondary looper carrier 25 has a rearwardlyextending arm 30 conuectod by means of a pitmau 31 with the shank of theprimary looper-currier 23. whereby the actuations of the secondarylooper 2; through shaft.

the connections 25, 27,. 28 and 29 with the main-shaft are transmitted.t-hr'ough e crank-arm 30, pitman 31 and carrier 23 -to the )rimarylooper 21.

Tie needle operates through the usual aperture in the throat-plate 32,forming a continuation of the work-plate 33., in'oo'tiperation with theprimary looper, which enters its thread loops beneath the throat-plate,and

x Thsiframe of the machine is provided with an upright bearing plate 40carrying a lateral fulcrum-stud 41 embraced by the boss 42 of thepresser-bar 43 carrying at its forward end the resser-foot 44 whose solepor tion is normally pressed upon the .throat late 32 by means of theressure spring 45 interposed between aishoul der of the presserbar andthe end of an adjusting screw' 46 entering asocket in the head of thebracketarm, in a well-known manner.

The usual lifting cam-lever any mounted upon the bearing plate 40 byn'ieansof the pin 48 and is adapted to engage the head of the screw-stud49 carried by the resser-bar and provided with a lock nut50.

The trimming mechanism comprises .an upper reciprocating knife 51 and alower stationary knife 52. The knife 51 is carried at the forward end ofa vibrating lever 53 which is pivoted at the opposite end and securelyheld against lateral movement by means of the headed fulcrum-pin 54mounted upon the bearing plate 40, and is pivotally connectedintermediate its ends by a bolt 55 with the upper end of an eccentricrod 56 whose lower end is provided with a strap 57 embracing the trimmeractuating eccentric 58 upon the main-shaft. The forward end of thetrimmer-bar 53 is forked to form a pair of spaced bearing members 59 towhich is fitted a tubular knife carrying bar on shaft (30 having atoneend a head 61 provided with a diametrical channel which is removublyfitted a gil) (32 having a longitudinal groove or channel (53 to whichthe knife blade 51 is fitted. The channel in the head 61 is closed bymeans of a cap-piece 64 secured thereto by screws 65, and the point of along clamping screw 66 entering the tubular shaft. 60, by engaging theback of the gib 62, serves to clamp the same with the blade 51inposition within the head 61.

47 is pivot The 00 is vided intermediate its bearings with a co ar 67having a bifurcated lateral lug 68 embracing a guide-rod 69 secured toand extendin between the bearing members 59,- such 00 lar beingadustably' secured upon the knife-bar by means of a set-screw 70, and aspring 71 is interposed between the collar 67 and'one of the bearingmembers 59, whereby the'upper knife 51 is pressed normall in contactwith the lower knife 52. As wi 1 be observed, by loosening the set-screw70, the'knife-bar may be turned in either direction to adjust the 11 peraide-bar 51 edgewise either forward y or ackwardly in the line of feed.By this means the upper knife may'be adjusted as close reciprocation 0the needle, its path of move,- ment bein accurately positioned toaccommodate di erent sizes of cord issuin [from the cord-guide, whichwill be describe later.

The lower knife-b1ade 52 is shown fitted to an inclined channel in acarrier-block 72 and clamped thereon by en agement therewith of thelaterally notche head 73' of the pin or plug 74. passing through suchblock and having u on its t readed opposite end portion a mil edclamping nut 75 by which the head 73 is-drawn mto operative engagementwith the blade 52 entering its notch. The carrier-block 72 is mounted insuitable guide-ways of the frame, and is provided with lugs 76 havingadjustable stop-screws 77 whose points are adapted to bear alternatelyupon a laterally projectin portion 78 of the main frame to limit t emovement ofsuch block and knife carried thereby transversely of thedirection of feed. The adjustment of this knife-carrying block iseffected by means of a screw 79 tapped into the member 78 of the machineframe and having a swivel connection with a slotted in 80 of the block72, and it may be secure clamped in any osition of ad ustment by meansof the astening screw 81 passing through a slot 82 in the member 78 ofthe machine frame and entering the block 72.

As will be readily understood, the shifting of the working position ofthe stationary knife 52 produces a correspondin lateral movement of thereciprocatin knife 51 which follows the same under tie yielding actionof the spring 71. The carrier-block is provided with a needle-guidingfinger 83 having an up )er edge slightlylnchned to the needle-pati toinsure a ainst the dcflection of the needle into the looper-path and theconsequent breakin of the need e.

The side of the base 1 a jacent the foot (5 of the bracket-arm isprovided with a-long1- tudinal seat to which is fitted the shank of abracket member provided with a longitudinal slot 85 entered by the shankof a fastening screw 86 tapped into the base and as possible to the pathof scenes adapted to secure such bracket-piece adjustably thereon, Tothe forward end of said bracketiece is attached by means of screws 87the cot 88 of an angular shield-plate having an upturned flange 89inclined at an angle similar to that of the forward i'tion fl -of thepresser-foot, and having its end disposed close to the up er trimmingknife 51 whereby it is adap to stri the trimmings. from the body of thefa ric' whose ed is to be provided with the overseam.

loosening the fastening screw 86,-"the shield plate with the su piece 84may be proper y adjusted.- when slit in the porting bracketthe-trinimingknives are reset for different -w'idths of oval-seam.

' As disclosed in m I J-pending application Ser. No. 321952, fil une I6,1906, to the forward end portion of the flange 89 of the shield-plate isfastened by means of screws 90 the shank-1110f a cord-guiding member 92which is provided 11 n its inner side with a longitudinal co -receivinggroove 93, the edge of the member 92 being spaced slightly from thedepending lip 94 of the shield-plate 'to'ailord a" longitudinalthreading-slit Tor'the cord-guidi channel afford- 'ed by the grooved memer 92 and the opposed "lip'94, as indicated particularly in Figs. 9 and10. The delivery end of the cord-guide has a transverse notch 95 sodisposed as to deliver the cord adjacent to and slightly below .the topof the throatplate, and the member 92 is formed with a notch 96throughwhich the cord d is ada ted to be led from an eyeof the thread-gui ingplate $7 beneath the tension device 98, the cord being threaded throughthe longitudinal guidi channel93 and directed 4 bythe latter to t elower edge ofthe material to'which it is secured by theoverseam.

The bracket-picce 84 carries a depending shield-plate 99 serving toshield the looper threads from the rotating arts beneath the work-plate,and the side 0 the base nearest the: rotor is inclosed by means of aremova e plate 100 having key-hole slots 101 (Fig. 1) receiving thefastening screws 102 and 103, and a thin sheet metal door 104 forming acontinuation thereof and having a hinge connection 105 along its loweredge to a plate 106 secured b screws 107 to the baseplate. The dependingshield-plate 99 obviously serves as an oil-guard to protect the threadhandling devices in front of the same, and the threads carried thereby,from I oil which is likely to be thrown from the rapidly movingactuating mechanism connected with the main-shaft. The upper edge of thesheet-metal door is adapted to latch itself upon the wire fastening pin108 secured to the bracket-piece 84 by means of one of the screws 87, asrepresented in Figs. 1, 4 and 9. The operative portion of thespring-wire fastening pin 108, which in .sulficiently to cause the doortosnapin behind the same, where it is yieldingly held in position, in amanner well-known. A finger-piece 109 is shown' applied to thecover-plate 100 for use in the removal of the latter for inspection ofthe looper mechanism; but in the threading of the loopers, it is inpractice necessary only to open the door 104 for access to the secondarylooper, the primary looper being accessible by bringing the same intoits advance position above the throatlate.

By the oregoiug description, I have indicated the preferred constructionand arrangement of the various parts of the ma chine, but it is to beunderstood. that the same may be varied to a considerable degree withoutdeparture from the scope of the present invention.

Having thus set forth the nature of the invention what I claim hereinis:

1. A trimming mechanism comprising a vibrating levermounted at one endupon and immovable endwise of :1 fixed flllCllllIl, u laterally yieldingknife-carrier mounted upon the opposite end of said lever, an upperknife-blade mounted in and supported solely by said carrier, and astationary-lower knifeblade coiiperating therewith.

2' A trimming mechanism comprising a vibrating lever mounted at one endupon and immovable endwise of a fixed fulcrum, a laterally movableknife-carrier mounted upon the opposite end of said lever, an upperknife-blade mounted in and supported solely by said carrier, astationary lower end to form spaced bearing members, an

cndwise movable knife-bar mounted in said bearing members, an upperknife-blade carried by said bar, a stationary lower knifebladecoiiperating therewith, and means applied to said knife-bar formaintaining the upper blade yieldingly in contact with the lowerknife-blade.

4. A trimming mechanism comprising a vibrating-lever mounted'upou afixed fulcrum at one end and forked at the opposite end to form spacedbearing members, an endwise movable knife-bar mounted in said bearingmembers, an upper knife-blade carried by said bar, a stationary lowerknifeblade coiiperating therewith, a thrust-collar fixed upon saidknife-bar intermediate its supporting bearings, and a spring interposedbetween said collar and one of said supporting bearings for applying ayieldmg endwise pressure upon said bar to maintam said upper knife inoperative relation with the lower knife.

5. A trimming mechanism com risin a vibrating lever mounted u on a xedlcrum at one end and forke at the opposite end to form s aced bearingmembers, an endwise movab e knife-bar mounted in said bearing members,an upper knife-blade carried by said bar, a stationary lower knifebladecooperating therewith, a thrust-collar adjustably secured upon saidknife-bar intermediate its su porting bearings, and provided witha forlred laterallug,'a uide-rod secured to and disposed interme iate thesupporting bearin 's of said knife-bar and embraced by the forked lug ofits thrustcollar, and a sprin'ginterposed between said collar and one ofsaid supporting bearings for applying a yielding endwise pressure uponsaid bar to maintain said upper knife in operative relation with thelower knife.

6. A trimming mechanism com rising a vibrating lever mounted u on a xedulcrum at one end, a tubular ife-supporting bar mounted transversely inthe opposite end of said lever, a knife-carrying hea upon said barprovided in its outer face with a transverse channel, a gib fittedremovably to said channel and itself provided in one face with achannel, an upper knife-blade fitted to the channel in said gib, a capsecured to the outer face of the knife-carrying head, a clamping screwentering said tubular bar and en aging said 'b and adapted to clamp saidmfe and gi in position in said head, and a stationar lower knifebladecoiiperating with sai up'per knifeblade. 0

7. A trimming mechanism comprising a frame, a vibrating lever having atone end a fulcrum fixed upon said frame, knife-blade carried by theopposite end of said lever and adapted to yield laterally thereon, acarrierlock mountedupon-and fitted to a slide-way in said frame, a lowerknife-blade carried by said block and.ex tending upwardly into 0 erativerelat1on with the upper knife-bla e, meansfor se-v curing said lowerkniferblade in position on said carrier-block, spaced stop members uponsaid carrier-block embracing aportion of the frame of the machine tolimit the degree of adjustment of the carrier-block 1n both directions,and means for ma1ntaming said carrier-block in position when adjusted. W8. A trimming mechanism comprising a, frame, a vibrating lever having atone end a-fulcrum fixed u on said frame, an n per knife-blade. carriedby the opposite en of an upper said lever and adapted to yield laterallythereon, a carrier-block mounted upon" and fitted to a slide-way in saidframe, a lower knife-blade carried by said block and ex tending upwardlyinto 0 erative relation with the u per knife-bladli, means for securingsm .7 on sa1d carr1er-block,spaced stop members upon said carrier-blockembracing a portion 0 the frame ofthe machine to limit the degree ofadjustment of the carrier-block in both directions, and an adjustingscrew swlveled to said carrier-block and entering afixed portion of saidframe.

t). In an overseaming and trimming machine, the combination with theframe and overseam-stitch-forming, feeding and trimm1 mechanisms mountedtherein, of a brac e -p1ece secured upon a fixed portion of said rameand adapted for adjustment toward and from said stitch-forming andtrimming mechanisms, a deflecting shield mounted upon said bracket-pieceand extended into close proximity to the trimming members for defiectinthe trimmings from the body portion of t ve-vvork,fand a cordguidesecured to and carried bythe o crative end portion of said shield.

10. In an overseaming and trimming machine, the, combination with theframe and overseam-stitch-forming, feeding and trimmin mechanismsmounted therein, of a brac et piece secured upon a fixed portion of$8,111 frame and ada ted for adjustment toward and from sai"stitch-fonning and trimming mechanisms j a deflecting shield .mountedupon said bracket-piece and extended into close proximity to thetrimming the body portion of the work, and a cordguldmg member Ion'tudi-nally grooved upon its inner side an secured to the 0 groove oposed to the latter to form a cordguidin c annel.

11. 11 an overseaming' and trimming machine, the combination with theframe and overseam-stitch-forming, feeding and trim min i mechanismsmounted therein, of a brac etpiece secured upon a fixed portion of saidframe and adapted for adjustment toward "and from said stitch-formingand trimming mechanisms, a mounted upon said ibrapket piece and extendedinto close pr'oximityto the trimming members for deflectin the trimmingsfrom the body portion of t e work,and a cordguiding member lon'tudinally grooved uponits'inner side an secured the operative endportion of said shiel with its grooved face opposed to the latter and saced therefrom to form a cord iding cliannel open along one side forintro notion of the cord.

12.111 anov g and trimming malower knife-blade in position members fordeflecting the trimmings from lOO erative end portion of'said shieldwith its deflecting shield said mainof the work and d chine, thecombination with the frame, a malmahaft ieu'miflqd therein, andova-seamstitch ,fceding and trimming mechvinkoperative eon nsptions withaha o a bracket 1eee secured n's'ona fixed OI'tLOH of frame and a forustmentgtoward and from stitchtorming, .feedin mechanismm'adeflectimountedu n bracket piece an] viextendedinto c one groximit to thetrimming members for defrom the-Body portion and anoll-guard platesecured to epending from said bracket-piece intel-mediate the main-shaftand stitch-forming members adjacent thereto I 13. In a sewing machine,the combination with stitchowning and feeding mechanisms, of a trimmingmechanismcomprising a reciprocating member, a knife-carrier mounted uponsaid member and adapted to yield transversely of the direction of-feed,

ali'fupper knife-blade mounted in said car -rier and adjust nbleparallelwith the line of v feed, and a stationary lower knife-blade enoperatingwith the upper knife-blade, p

14. In a sewing machine, the combination with stitch-formlng and feedingmechanisms, of a trimming mechanism comprising a keciprocating member, aknife-carrier, a bar mounted upon and transversely of said reciprocatingmember upon which the knifeearrler is fixed, an upper knife-blademounted in said carrier, a stationary lower knife-blade e06 ratingtherewith, means aplied to said E131- for pressing the upper ife-bladeieldingly in contact with the lower knifeiade, and means for providingcircular adj ustment for the knife-carrier bar to afford edgewiseadjustment of the u per knife-blade relative to the lower knife-b ade.in testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses. ALFRED GRIEB. Witnesses:

HENRY J. MILLER, Josnrn' F. JAQUITH.

